Improvement in steam-conducting pipes



G. P. SMITH. Steam-Conducting 'Pipe. No. 223,072. Patented Dec. 30,1879.

lNVENTOR ATTORNEY WITNESSES 1 l m wmqum.

UNITED STATES PATENT OFFICE.

GEORGE P. SMITH, OF BAY OITY, MICHIGAN.

IMPROVEMENT IN STEAM-CONDUCTING PIPES.

Specification forming part of Letters Patent No. 223,072, dated December 30, 1879 application filed October 11, 1879.

To all whom it may concern:

Be it known that I, GEORGE 1?. SMITH, of Bay City, county of Bay, and State of Michigan, have iln'ented an Improvement in Steam- Oonducting Pipes; and I declare the following to be such a full, clear, and exact description thereofas will enable others skilled in the art to which my invention pertains to make and use it, reference being bad to the accompanying drawings, which form a part of this specification.

My invention consists in a compound steampipe composed of an inner metallic pipe and an outer bored wood pipe, the latter having its exterior surface coated with asphaltum or other cement which shall be impervious to moisture.

In the drawings, Figure 1 represents a crosssection, and Fig. 2 a view in longitudinal section, of a steam-pipe and wood covering embodying my invention.

I am aware that wood tubing has been employed for conveying water and other fluids; so, also, am I aware that steam-pipe has been incased in wood tubing. It is well known, however, that wood in a dry state is an excellent non-conductor of heat, but that wood in a wet or moistened state is a very good conductor of heat. Therefore, when steam is conveyed through wood tubing, and that tubing buried in the ground, if the tubing is not pro tecti-d upon its exterior surface it will absorb moisture from the earth, and as a consequence the heat from the steam is rapidly conducted ofl" by convection.

My invention relates to a conductingtube for steam or hot water, when the same is designed to be buried in the ground; and it consists in a metallic tube iucased in a bored wood pipe coated upon its outer surface with asphaltum cement or other substance which will resist moisture and prevent the wood from absorbing moisture from the ground, thereby maintaining the wood in a dry state, in a condition to conduct away the minimum amount of heat from the steam or other fluid that is passing through it, and forming, by the combination, a compound conducting-pipe, which is at once protected from insects, worms, &c., and which will allow of the maximum amount of heatin the contained steam or other fluid.

In the drawings, A represents a metallic pipe. B is a bored wood pipe, which incases the metallic pipe. This wood pipe I prefer to be round, though it may be square or of any angular form in cross-section. The outer coating is represented at O. This I prefer to be asphaltum, because it is at the same time impervious to moisture and is an excellent antiseptic; but instead of asphaltum I may employ hydraulic cement, or any other suitable cement or composition. So, also, instead of simply coating the exterior surface, the body of the wood itself may be treated to a bath of parafline or oil or the same may he forced through its pores in ways well known in the art of preparing woods to preserve them, the object of my invention being, in its broad sense, to so pepare the bored wood pipe that it shall resist moisture and maintain practically the non-conducting character which is possessed by wood in a dry state. These separate sections of the compound pipe thus formed may be united by any suitable joints, many of which are well known to those conversant with the art of pipe laying.

WVhat I claim is .l. A compound pipe consisting of a bored wood pipe and an iron pipe titted within the bore, said wood pipe being coated on its exterior surface with water-proof material, substantially as set forth.

2. A compound pipe consisting of a bored wood pipe and an iron pipe fitted within the bore, said wood pipe being coated with a water-proofand antiseptic material, substantially as set forth.

3. Acompound pipe consisting of a bored wood pipe and an iron pipe fitted in its bore, said wood pipe being provided with an exterior coating of asphaltum, substantially as set forth.

In witness whereof I affix my signature in the presence of two witnesses.

GEORGE P. SMITH.

Witnesses:

BYRON E. WARREN, J NO. IVIULHOLLAND. 

